# Photons Energy Level

Air
I understand that electrons are excited to higher energy levels. When they fall back levels, photons are emitted.

If green light has wavelength $5.58 \times 10^{-7}m$ and red light has wavelength of $6.48 \times 10^{-7}m$, why is it that when a photon is emitted from green light, it falls a greater energy level?

Homework Helper
Gold Member
What is the relationship between energy and wavelength for electromagnetic waves?

Air
$v = f \lambda$
$E = hf = \frac{hv}{\lambda}$

So green light has a smaller wavelength hence a larger value of energy. Is this why it falls a greater energy level?

Homework Helper
Yes, that is so.

atom888
$v = f \lambda$
$E = hf = \frac{hv}{\lambda}$

So green light has a smaller wavelength hence a larger value of energy. Is this why it falls a greater energy level?

so... if E=hf, green light have more energy than red light?

Homework Helper
Yes, but that energy is per photon.